The highest heaven and 7th firmament is shown to a number of Patriarchs and Prophets, as it is where the throne of the Most High God is. This “heaven of heavens” is mentioned multiple times in the modern canon:
Deuteronomy 10:14
Behold, to the Lord your God belong heaven and the highest heaven, the earth and all that is in it.
Nehemiah 9:6
You alone are the Lord; You have made heaven, The heaven of heavens, with all their host, The earth and everything on it, The seas and all that is in them, And You preserve them all. The host of heaven worships You.
See also: 1 Enoch 70:6, Deuteronomy 10:14, 1 Kings 8:27, 2 Chronicles 2:6, 2 Chronicles 6:18, Psalms 68:33, Ecclesiasticus 16:18
Though a numerical quantity of the total
heavens is not specified in the common western Bible of today, collections of scripture from across the world and throughout time have included other books that do:
Apocalypse of Abraham 10:4-8
And the angel whom He had sent came to me in the likeness of a man and grasped me by my right hand and set me up upon my feet and said to me, “Stand up Abraham, O friend of God who loves you; let not the trembling of man seize you! For lo! I have been sent to you to strengthen you and bless you in the name of God, who loves you, the Creator of heaven and earth. Be fearless and hasten to Him. I am called Jaoel by Him who moves those who exist with me on the seventh expanse over the heavens, a power in virtue of the ineffable Name that is dwelling in me.”
Apocalypse of Abraham 19:5-6
And I looked downwards from the mountain on which I stood to the sixth firmament, and there I saw a multitude of angels of pure spirit, without bodies, whose duty was to carry out the commands of the fiery angels who were upon the seventh firmament, as I was standing suspended over them.
Testament of Levi 3:1
Listen concerning the seven heavens.